It also doesn't prevent you from stealing (or buying) a machine that can make licence plates.
You can't defend against everything, but any criminal who defeats the current license plates wouldn't have been caught based on his license plate anyway.
The font is enough to make plate manipulation not worth the effort for average criminals and for people trying to defeat speed cameras. Going any further than that isn't worth the effort.
In any case those would be devices that terrorists (usually kids who excel more in ideology than in training) on the run would not have with them, to quickly change the identity of the car they stole.
This is not a sophisticated anti-forgery scheme, it's a no-cost layer of tamper resistance.
You can't defend against everything, but any criminal who defeats the current license plates wouldn't have been caught based on his license plate anyway.
The font is enough to make plate manipulation not worth the effort for average criminals and for people trying to defeat speed cameras. Going any further than that isn't worth the effort.